9+99+999+9999+99999；1+2+3+4+5+6+7+8+9+10+9+8+7+6+5+4+3+2+1；2+10+18+26+34+42+50+58
    9+99+999+9999+99999=
    【1+2+3+4+5+6+7+8+9+10】*7
    8+88+888+8888+88888+888888+8888888+88888888+888888888+8888888888+88888888888；【2+4+6+8+10+12+14+16+18+20】-【1+3+5+7+9+11+13+15+17+19】；365+364-363-362+361+360-359-358+357+356-355-354+353+352-351-350+349
    1*2+2*3+3*4+4*5+5*6+6*7+7*8+8*9+9*10；30-29-28+27+26-25-24+23+22-21-20+19+18-17-16+15+14-13-12+11+10-9-8+7；2+4+6+8+10+12+14+16+18+20+22+24-1-3-5-7-9-11-13-15-17-19-21-23
    28+208+2008+20008；15*16+16*18+33*24；【24+64】*【56-1】
    0.0089×7.145×3^2+0.0174×1.875×3^2=
    0.0409×7.145×3^2+0.0965×1.875×3^2=
    0.01422×7.145×3.6^2+0.0188×1.875×3.6^2
    0.05492×7.145×3.6^2+0.0936×1.875×3.6^2=
    0.0153×6.77×3.6^2+0.0210×1.5×3.6^2
    0.0530×6.77×3.6^2+0.0892×1.5×3.6^2
    0.0038×7.145×3^2+0.0174×1.5×3^2=
    0.0400×7.145×3^2+0.0965×1.5×3^2=
    6-8/11
    0.0091×7.145×3.6^2+0.0188×1.875×3.6^2=
    6-11/8
    0.0405×7.145×3.6^2+0.0965×1.875×3.6^2=
    0.0093×6.77×3.6^2+0.0210×1.5×3.6^2=
    0.0399×6.77×3.6^2+0.0892×1.5×3.6^2=

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